Process for oxidizing organic compounds



Patented Sept. 6, 1932 UNITED STATES PATENT' OFF-ICE,-

HANS KLEIN, or IDA-8: MARIENH TTE; NEAR snAnAu, GERMANY PROCESS FOR OXTDIZING ORGANIC COMPOUNDS No Drawing. Application filed. September 27, 1926, Serial No. 138,125, and in Germany October" 19, 1925.

place approximately as illustrated by the fol-' lowing equations (a) Trithionates. They break up into thiosulphate and sulphite while combining with 2Me (Me represents an equivalent of a base ion).

(b) Tetrathionates are converted into 2 molecules of thiosulphate, while combining with 2Me.

0 0250MB OBSOMG Q g ZMeOH- I +ZOH O2. SOMe 8MB 7 (0) Pentathionates. They break up into 2 mols. thiosulphate and 1 atom sulphur while combining with 2Me.

0780MB O2SOMe Me 40 g ZMeOH- s +2OH ISMe OzSOMe OzbOMe =2O2SOMe In all cases for each molecule of polythio-i 3' nateaccordingto the formula,

son (or H2o+o is set free, which explains the oxidizing action.

Ewample l A solution is taken of the reaction product of one equivalent methylaniline, one equivalent carbon disulphide and one equivalent of a base. In a solution for instance of 250 ccms. it may be assumed that 18.0 grams methyl aniline, and 13.6 grams carbon disulphide were originally present, quantities which would be expected to give 32.7 grams di- 3 methyl-diphenybthiuramdisulphide. Tothe solution of the corresponding dithiocarbamic acid prepared therefrom sufiicient polythionate solution is added drop by drop while stirring, until the precipitation is complete. The resulting disulphide is pure white. The reaction mixture is allowed to stand 10-15 minutes. It is then filtered, washed with water and dried. Yield 28.5 grams=88% of theoretical yield. on any scale.

Example If (a) A solutionof 1/50 mol N-dimethyldithiocarbamic acid salt in 100 ccms. water, prepared from 1/50 mol dimethylamine (=O.9 g.) and at the same time (b) a solution of a little more than the calculated amount of The reaction can be carried out sodium tetrathionate also in 100 ccms. water are introduced drop by drop into 50 ccms. water during about an hour while stirring and cooling with ice. After another quarter of an hour the mixture is filtered with suction 2 ima e and the filtrate Washed with water. Yield 2.180 grams N-N-N-Ntetmmethylthiuramdisulphide. The reaction can be carried out on any scale;

What I claim is 1. A method of producing N-substituted thiuraindisulphides consisting in oxidizing N-substituted dithiocarbainates With a solution of e polythionate.

2. A method of producing N-substituted thiuramdisulphides, consisting in oxidizing N-substituted dithiocarbamates with an alkaline solution of a polythionate.

In testimony whereof I have signed my name to this specification.

HANS KLEIN. 

